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<br /> <br />(.'") <br /> <br />~, <br /><.:: <br />r~ <br /> <br />....;..T: <br />L <br /> <br />?',~~ I <br />.......'\:'r_?_::.F.^,I..ITy :31':". .;.r-"', <br /> <br />f...~ OF PS7 <br /> <br />0r:J~CTIV2 0;' '::HE UV~'--:':;:C.\':'IO~; <br /> <br />Assess~er.t of t~e ~ater-qu31ity situation i~ th~ COIOTddo River <br />basi:! ....bc\.e Lee -::'err:r. t:; the Geolo[ical SUY've:;. le;7:tn in ~"57. The <br />principel s~ecific objective has bee~--~o f~r ~3 was rr~cticnble ~rom <br />inf':::r'8tion Dt. hand or cbta:.nable ....i t.hin t:-lIO' s?ar. cf 5. reI." yea!'s unc.er <br />a ffi0Jest Lud~e~--to _iscri,~~ate nat~ral R~d ~~~-C~~S€~ cGmpon~~ts of <br />th~ dissolved-solids load tJ:fI":. '..'a:; in L.~ stre~ :'!ot.>:.i as of 1957 t!.nd <br />to scale t;be size c~ e!l.ch major cC::'!="Gr.cor.t. T:'t: cc;:',onents havin[ been <br />identIfied erJd scaled, an info:"n.::iliv(; uY:Jothe"'~ic.:11 ;[.::J.el o:~ the virs;in <br />\:o.ter-1uality sitl1o:ticn can be c0-p~ted r'~cd:ly. althouch thi..> '~'as not <br />11 ba5ic pt<r;C'o:e of the investi;3.tior.. <br /> <br />T-wo reports on this i::ve~'-::~3ati(jn hf'.ve be~::. cG::Jpleted in :::nnu- <br />scri'?t fo1'.:o "t-:,' th~ G..?oloeicc.l . _ ":"'h::Y. 2o-:;h c!lrry tLe r-enc!"A.l ti',le. <br />"I-.'ater resour:::0.5 of the Drper ";.:.lorado F-:ver basin. clorado. VJc:-~ing. <br />Ut.:-..i:l. !i-:!l,' :,,:!)'..:.co. and ,t..ri;:cn3." One,.:! "?<tsic ds.ts. re:0rt" of 1,305 <br />"a,;e3. collects ."..:. SUIl'X1.'1ri.'es stetistica: I.'ater i:lfcrna...:o'; it j;,:;..s <br />been rel<;::<>sea 3:': of De.:'~,.,.ber 1961 ~n"_ rl.\:a:ts ~,...1)1ic<;.ti"n ...~, r~''J:'e,3ional <br />P-'rl"'r "42 Th, o't-,-~,,,, <. ""'o-'nr.'o"l ro-ort" ,,'rf"-" ....._...., ,. .-1",,-;....... <br />.....!'- . . u'- ....1_.., ...,- _.. c. ~..' ,U .J ~.c.._,;;; . _..__...........'" <br />ntiilercus fifures anJ tc.r-les. t\'....!\its relo;-as'~ an:.! r:",l:lic!1.tio~J. I~ does <br />!'lot undertak~ to assess the ef~ect;;.': of '\.l2te:--:::3:1"l.::-er'lent r.;.C'<:~' ..~~s begun <br />or ~o::.te:::!'l('ted ufter 1957. G~;l~!,r;.l :l.'1c. ::!If:C'i_~.:.~ <'IL'-.J::l.ri('s cf this <br />tec~lr.iC'll reI :>rl;. t:l11c;..r. <br /> <br />- <br />